DatabaseSchema_pgsql::addUniqueKey

Add a unique key.

@throws DatabaseSchemaObjectExistsException If the specified table already has a key by that name.

Parameters

$table: The table to be altered.

$name: The name of the key.

$fields: An array of field names.

Overrides DatabaseSchema::addUniqueKey

Throws

DatabaseSchemaObjectDoesNotExistException If the specified table doesn't exist.

File

includes/database/pgsql/schema.inc, line 456

Database schema code for PostgreSQL database servers.

Code

function addUniqueKey($table, $name, $fields) {
  if (!$this->tableExists($table)) {
    throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot add unique key %name to table %table: table doesn't exist.", array('%table' => $table, '%name' => $name)));
  }
  if ($this->constraintExists($table, $name . '_key')) {
    throw new DatabaseSchemaObjectExistsException(t("Cannot add unique key %name to table %table: unique key already exists.", array('%table' => $table, '%name' => $name)));
  }

  $this->connection->query('ALTER TABLE {' . $table . '} ADD CONSTRAINT "' . $this->prefixNonTable($table, $name, 'key') . '" UNIQUE (' . implode(',', $fields) . ')');
}